Cannot cancel Drag when Dialog exec() is fired [Windows]

[LepaBrena]

In Windows when I drag item and dialog exec() is called I cannot do anything. I cannot cancel drag neither click on dialog buttons.
QDrag::cancel() is called before dialog exec() and still nothing. Also I tried to call processEvents() after cancel, with our without time delay, but it still do nothing.

int myDialog::exec()
{
    getActiveDrag()->cancel();
 
    QTime dieTime= QTime::currentTime().addSecs(1);
 
    while (QTime::currentTime() < dieTime)
    {
        QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
    }
 
    return QDialog::exec();
}

int myDialog::exec()
{
    getActiveDrag()->cancel();

    QTime dieTime= QTime::currentTime().addSecs(1);
    
    while (QTime::currentTime() < dieTime)
    {
        QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
    }
    
    return QDialog::exec();
}

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I've found that similar problem is reported to Qt, but maybe someone has some workaround.
https://bugreports.qt.io/browse/QTBUG-58661